Okay, but I wouldn't be convinced until I've counted up to 756,912 myself and seen that there are no more leaves left after that. Isn't it supposed to be less computationally intensive to verify the proof than to complete the original calculation?

I tried learning about zero knowledge proofs during the crypto craze, but I never understood the basic idea of how it was supposed to work, much less the math involved. I'd appreciate an ELI5 from anyone who has one.